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The 1991­2005 National Solar Radiation Database

The success of any solar energy installation depends largely on the site's solar resource. Therefore, detailed knowledge of an area's solar resource is critical to installation planning and siting. To help with these efforts, the National Renewable Energy Laboratory (NREL) and the National Climatic Data Center (NCDC) have updated the National Solar Radiation Database (NSRDB). Since 1992, the database has provided solar planners and designers, building architects and engineers, renewable energy analysts, and countless others with extensive solar radiation information. The 1991­2005 NSRDB contains hourly solar radiation (including global, direct, and diffuse) and meteorological data for 1,454 stations. This update builds on the Distribution of 1961­1990 NSRDB sites and 1991­2005 NSRDB sites by class and measured solar data 1961­1990 NSRDB, which contains data for 239 stations. The update includes the conventional time series for NSRDB ground stations as well as a one-tenth-degree Measured Data gridded data set that contains hourly solar records for 8 years (1998­2005) for the United States (except Alaska Forty stations in the updated NSRDB include measured above 60° latitude) for about 100,000 pixel locations (at a solar data, which was supplied by: nominal 10-km-by-10-km pixel size). · The Atmospheric Radiation Measurement Program, Station Classification U.S. Department of Energy · The Florida Solar Energy Center, State of Florida To increase data quantity, developers relaxed the standard · The Integrated Surface Irradiance Study and Surface of serial completeness mandated by the 1961­1990 Radiation Budget Measurement Networks, National NSRDB. In the update, all gaps in station records were Oceanic and Atmospheric Administration Air filled, and the stations were classified by data quality. The 221 Class I stations have a complete hourly data set Resources Laboratory and Earth System Research for the 1991­2005 period and were produced with the Laboratory Global Monitoring Division best available input data. The 637 Class II stations have a · The Measurement and Instrumentation Data Center, complete hourly period of record, but they have a higher National Renewable Energy Laboratory uncertainty because of lower-quality input data. The 596 · The University of Oregon Solar Radiation Monitoring Class III stations contain gaps in the period of record but Laboratory Network have at least 3 years of data that may be useful for some · The University of Texas Solar Energy Laboratory. applications.

NSRDB Data Access Options

Data Set

NSRDB solar and filled meteorological fields NSRDB solar and Integrated Surface Database meteorological fields (no data filling) NSRDB solar fields (no meteorological) SUNY 10-km gridded data NSRDB statistical summaries NSRDB research solar fields (no meteorological)

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URL a Planned for a late-2007 release at and http:// a b b b b

No-cost access is domain-restricted to .mil, .gov, .edu, and .k12. A fee-access restriction applies to all other domains. No fee.

A significant difference between the 1961­1990 and 1991­2005 NSRDBs involves data storage. In the original, measured data were merged with modeled data such that a seamless data set of solar radiation values was produced. (The model essentially filled gaps in the measured data.) The update includes fields for both, which allows users the flexibility to choose modeled or, if available, measured data for an application.

describes the data and how the database was developed. The manual includes a complete list of stations and a data quality summary for each site.

Project Participants

Primary project funding came from the Department of Energy. Additional support was provided by: · The Atmospheric Sciences Research Center, State University of New York at Albany · Climate Systems Branch, National Aeronautics and Space Administration · National Climatic Data Center, U.S. Department of Commerce · Northeast Regional Climate Center, Cornell University · Solar Consulting Services, Colebrook, New Hampshire · Solar Radiation Monitoring Laboratory, University of Oregon.

Data Access

The updated NSRDB is distributed via the Internet. NCDC distributes a conventional data set that includes modeled and measured (when available) solar data and key meteorological observations. It also distributes the 10-km gridded data set and a ground-based solar-only data set at no cost and will include the solar data in its Integrated Surface Database infrastructure (without any filled meteorological data). NREL distributes a superset of the solar data without any meteorological fields. This solar research data set includes all modeled data, special clearsky data fields, and other atmospheric components.

Additional Information

For more information, contact Steve Wilcox at [email protected] or 303-384-7785.

User's Manual

Users interested in the NSRDB should start with the NSRDB user's manual, which is available at http:// This document

National Renewable Energy Laboratory · 1617 Cole Boulevard, Golden, Colorado 80401-3393 · 303-275-3000 · Operated for the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy by Midwest Research Institue · Battelle NREL/FS-581-41595 · May 2007

This publication is subject to government rights. Printed with renewable-source ink on paper containing at least 50% wastepaper, including 10% post consumer waste.


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